<template >
  <div :style ="note" >
    <el-form ref="loginForm" :model="form" :rules="rules" label-width="80px" class="login-box">
      <h3 class="login-title">欢迎登录</h3>
      <el-form-item label="账号" prop="username">
        <el-input type="text" placeholder="请输入账号" v-model="form.username"/>
      </el-form-item>
      <el-form-item label="密码" prop="password">
        <el-input type="password" placeholder="请输入密码" v-model="form.password"/>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" v-on:click="onSubmit('loginForm')">登录</el-button>
      </el-form-item>
    </el-form>

    <el-dialog
      title="温馨提示"
      :visible.sync="dialogWarnVisible"
      width="30%"
      :before-close="handleClose">
      <span >请输入账号和密码</span>
      <span slot="footer" class="dialog-footer">
        <el-button type="primary" @click="dialogWarnVisible = false">确 定</el-button>
      </span>
    </el-dialog>
    <el-dialog
      title="温馨提示"
      :visible.sync="dialogErrorVisible"
      width="30%"
      :before-close="handleClose">
      <span v-text="error"></span>
      <span slot="footer" class="dialog-footer">
        <el-button type="primary" @click="dialogErrorVisible = false">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: "Login",
    data() {
      return {
        note: {
          backgroundImage: "url(" + require("../assets/background.jpg") + ") ",
          backgroundPosition: "center center",
          backgroundRepeat: "no-repeat",
          backgroundSize: "cover" ,
        },
        form: {
          username: '',
          password: ''
        },

        // 表单验证，需要在 el-form-item 元素中增加 prop 属性
        rules: {
          username: [
            {required: true, message: '账号不可为空', trigger: 'blur'}
          ],
          password: [
            {required: true, message: '密码不可为空', trigger: 'blur'}
          ]
        },

        // 对话框显示和隐藏
        dialogWarnVisible: false,
        dialogErrorVisible: false
      }
    },
    methods: {
      onSubmit(formName) {
        // 为表单绑定验证功能
        this.$refs[formName].validate((valid) => {
          if (valid) {
            // 使用 vue-router 路由到指定页面，该方式称之为编程式导航
            //this.$router.push("/main");
            this.$axios.post(
              '/login',
              {
                username:this.form.username,
                password:this.form.password
            })
            .then(resultResponse => {
              this.resultResponse = JSON.stringify(resultResponse.data)
              //成功后执行 带着用户名跳转到Main页面
              if(resultResponse.data.code === 200) {
                this.$router.replace({
                  name:'Main',
                  params:{
                    username :resultResponse.data.object.username
                  }
                  })
              }else if(resultResponse.data.code === 400) {
                 this.dialogErrorVisible = true;
                 this.error = resultResponse.data.msg;
              }
            })
            .catch(failResponse => {})
            
          } else {
            this.dialogWarnVisible = true;
            return false;
          }
        });
      }
    }
  }
</script>

<style lang="scss" scoped>
  .login-box {
    border: 1px solid #DCDFE6;
    width: 350px;
    margin: 180px auto;
    padding: 35px 35px 15px 35px;
    border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    box-shadow: 0 0 25px #909399;
  }

  .login-title {
    text-align: center;
    margin: 0 auto 40px auto;
    color: #303133;
  }
 
</style>